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110 lines
3.7 KiB
110 lines
3.7 KiB
/*
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* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
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/*
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* Copyright 1999-2004 The Apache Software Foundation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* $Id: FuncLoader.java,v 1.1.2.1 2005/08/01 01:30:35 jeffsuttor Exp $
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*/
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package com.sun.org.apache.xpath.internal.compiler;
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import javax.xml.transform.TransformerException;
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import com.sun.org.apache.xpath.internal.functions.Function;
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import com.sun.org.apache.xalan.internal.utils.ObjectFactory;
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import com.sun.org.apache.xalan.internal.utils.ConfigurationError;
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/**
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* Lazy load of functions into the function table as needed, so we don't
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* have to load all the functions allowed in XPath and XSLT on startup.
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* @xsl.usage advanced
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*/
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public class FuncLoader
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{
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/** The function ID, which may correspond to one of the FUNC_XXX values
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* found in {@link com.sun.org.apache.xpath.internal.compiler.FunctionTable}, but may
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* be a value installed by an external module. */
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private int m_funcID;
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/** The class name of the function. Must not be null. */
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private String m_funcName;
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/**
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* Get the local class name of the function class. If function name does
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* not have a '.' in it, it is assumed to be relative to
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* 'com.sun.org.apache.xpath.internal.functions'.
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*
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* @return The class name of the {com.sun.org.apache.xpath.internal.functions.Function} class.
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*/
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public String getName()
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{
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return m_funcName;
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}
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/**
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* Construct a function loader
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*
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* @param funcName The class name of the {com.sun.org.apache.xpath.internal.functions.Function}
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* class, which, if it does not have a '.' in it, is assumed to
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* be relative to 'com.sun.org.apache.xpath.internal.functions'.
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* @param funcID The function ID, which may correspond to one of the FUNC_XXX
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* values found in {@link com.sun.org.apache.xpath.internal.compiler.FunctionTable}, but may
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* be a value installed by an external module.
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*/
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public FuncLoader(String funcName, int funcID)
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{
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super();
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m_funcID = funcID;
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m_funcName = funcName;
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}
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/**
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* Get a Function instance that this instance is liaisoning for.
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*
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* @return non-null reference to Function derivative.
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*
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* @throws javax.xml.transform.TransformerException if ClassNotFoundException,
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* IllegalAccessException, or InstantiationException is thrown.
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*/
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Function getFunction() throws TransformerException
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{
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try
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{
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String className = m_funcName;
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if (className.indexOf(".") < 0) {
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className = "com.sun.org.apache.xpath.internal.functions." + className;
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}
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//hack for loading only built-in function classes.
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String subString = className.substring(0,className.lastIndexOf('.'));
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if(!(subString.equals ("com.sun.org.apache.xalan.internal.templates") ||
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subString.equals ("com.sun.org.apache.xpath.internal.functions"))) {
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throw new TransformerException("Application can't install his own xpath function.");
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}
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return (Function) ObjectFactory.newInstance(className, true);
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}
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catch (ConfigurationError e)
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{
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throw new TransformerException(e.getException());
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}
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}
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}
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